util.common.js#copy

util.js

        copy: function(oldObj) {
            var newObj,
                key,
                len,
                type,
                copy = Y.mojito.util.copy;

            if (!oldObj) {
                return oldObj;
            }

            type = Y.Lang.type(oldObj);

            if (typeof oldObj !== 'object' ||
                    (type === 'regexp' || type === 'function')) {
                return oldObj;
            }

            if (type === "array") {
                newObj = [];
                len = oldObj.length;
                for (key = 0; key < len; key += 1) {
                    newObj[key] = copy(oldObj[key]);
                }
                return newObj;
            }

            newObj = {};
            for (key in oldObj) {
                if (oldObj.hasOwnProperty(key)) {
                    newObj[key] = copy(oldObj[key]);
                }
            }
            return newObj;
        }